Hatchway-door mechanism



(ModeL) 2 Sheets-Sheet 1. r .C. H. 'MITCHELL.

Hatchway D001 Mechanism.

No. 235,795. Patented Dec. 21,1880.

Nmnzis, PuOW-UTHDGRAPHER. WASHWGIOH, 01c

I "2 sheets sneez'2. I O. H. MITCHELL. Hat'chway Do or Mechanism.

Patented Dec}. 21,1880.

(Model.

,e a l 1i A I H I HLZ I'I" igfifi'ma asrs: H ginllmfmm RAXLMRM N PETERS, PHOTO-LITNOGRAPMER. WASHINGTON D C Uivrrnn "rates CHARLES H. MITCHELL, OF CHICAGO, ILLINOIS.

HATCHWAY- DOOR ECHANI SM.

SPECIFICATION forming part of Letters Patent N0. 235,795, dated December 21, 1880.

ApplicationfiledApfilQl, 1880. (ModeL) To all whom it may concern Be it known that I, CHARLES H. MITCHELL, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hatchways for Elevators; and I do hereby declare that thefbllowingis a full, clear, and exact description of the invention, which will enable others skilled. in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, andto the letters of reference marked thereon, which form a part of this specification.

I Figure 1 is a side elevation of my improved elevator. Fig. 2 is a similar view of the same with the hatchway or doors such as are employed in the floor of one of the stories of the house or store or warehouse, and Figs. 3 and 4 are detail views of the same.

This invention has relation to improvements in elevators for stores, warehouses, dwellings, and hotels, the object being to effect the opening and closing of the hatchway or passageway doors by the ascending or descending elevator; and it consists of certain mechanism adapted to be operated by the action of the elevator, substantially as hereinafter more fully set forth.

In the accompanying drawings, A A mark the upright ways, between which the platform or car travels, and which extend from the lower floor to the upper story of the building.

13 is the platform or car, adjusted in position in the usual way between the uprights A A, and of the ordinary construction. The platform or car B is provided upon each side with a rack, a a, which engages with the pinions 1), as shown in Fig. 3, upon the sides of the uprights or ways A, and which further engage with the pinions c 0 upon the sides of the ways or uprights A, as will be presently seen.

0 G are the meeting hatchway or passageway doors, which are hung in recesses of the ways A, about on a level with the floor of the building, it being designed to have doors for each floor to close the passage or hatch way of the elevator as it passes above or below the floor through each story. These doors 0 C are connected by links, rods, ropes, or chains 61 to sliding bars 01, confined to the sides of the ways or uprights A in any suitable manner. These sliding bars are provided with teeth d d at their ends, and connected to suspended weights D by cords e, (or their equivalents,) passingover pulleys f, suitably hung and fastened to the sliding bars in any known way. The pinions b mesh with the racks I), connected to the sliding bars 01, as shown in Figs. 2 and 3.

It will be observed that as the car or platform, being in its lower position, ascends, its racks will rotate the pinions b, with their pinions b, which will engage with and elevate the racks b of the sliding bars 61, and they, in turn, will cause the sliding bars to ascend, by which it will be seen that they will draw up and gradually elevate the doors out of the way of the approaching or ascending car or platform and allow the latter to pass without interference therewith.

It will also be noticed that as the platform rises above the upper end of the door the racks on the car will engage with the pinions c, which, in turn, will mesh with and depress or lower the toothed sliding bars (1 as against the upward force exerted thereon by its weights D, which will allow the doors to again close with the descent of the sliding bars 01.

The foregoing combination and arrangement of parts effects the opening and closing of the doors, which close the hatchway or passageway of the elevator with the ascent and descent of the car or platform, thereby providing for the immediate closing of the doors or the filling up of the hole in the floor when the car of the elevator has passed either above or below, and by the action of theelevator itself, thus keeping the hole or hatchway in the floor closed at all times other than during the ascent or descent of the elevator, and then only temporarily, without liability of the doors being left open.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an elevator for buildings, the combination of the car or platformihaving the racks with the uprights or ways having pinions at or near their lower ends, with inside pinions and slides having racks and connected to the doors, substantially as and for the purpose set forth.

2. In an elevator for buildings, the car or platform having the racks, in combination with the uprights or ways having pinions at their upper ends, the slides having racks at the same ends and connecting with the doors, substantially as and for the purpose specified. 3. In an elevator for buildings, the car or platform having racks, in combination Wl DlT the uprights having pinions, as described,

slides or bars having both their upper and lower port-ions provided with racks and connected with the doors and weights, substantially as and for the purpose set forth.

In testimony that I claim the foregoing 'as my own I have hereto affixed my signature in presence of two witnesses.

CHARLES H. Mironnnn.

Witnesses WM. SMITH, JOHN BALDWIN. 

